Washing, desulphurizing, bleaching, finishing, and like treatments of artificial yarns



A. NAI

Sept. 27, 1938.

WASHING, DESULPHURIZING, BLEACHING, FINISHING,

AND LIKE TREATMENTS OF ARTIFICIAL YARNS Filed June 6, 1956vlniflilllllllilllllllll Patented Sept. 27, 1938 UNITED STATES PATENTOFFICE WASHING, DESULPHURIZING, BLEACHING,

FINISHING, AND 3. 1m: TREATMENTS, or

. ARTIFICIAL 'YAR Alfredo Nai, Milan, Italy, assignor to ChatillonSocieta Anonima Italiana per le Fibre Tessili Artificiali, Milan, ItalyApplication June 6, 1936, Serial No. 83,998 a In Italy April 9, 1936 1Claim.

cut when still acid while in the otherthe cutting occurs after washingand in some cases after de- 1 10 sulphurizing, bleaching, dyeing, andthe like operations have been effected.

It has been shown that processes of the sec-' ondtype present remarkableadvantages over processes of the first type and-in order to render morerationalthe washing and subsequent treatments various provisions havebeen made and adopted some of which are the subject matter of patents.

According to some of said processes the bundle 20 of continuousfilaments is passed through a shower of water in the washing, and undera. shower of the solutions required for the other treatments: accordingto others the washing and treatments are executed on the silver immersed25 in a vat or open channel.

In the specification of another patent of same applicant a process isdescribed for washing, desulphurizing, bleaching and dyeing artificialyarns in countercurrent in open channels.

According to the invention the washing, desulphurizing, bleaching,dyeing or other finishing treatments are efiected in one or more tubesthrough which water or other liquid appropriate for the treatment of theyarns or filaments is caused to travel, so entraining the bundle offilaments or sliver.

Preferably in accordance with the invention the liquids are admittedinto the tubes in which the treatment is effected by means of aninjector,

40 the liquid thus being caused to entrain the yarn,

bundle of filaments or sliver.

The invention extends also to apparatus for carrying the invention intoeiIect, such apparatus comprising a tube or a series of tubes each 5 ofwhich is connected at oneend with an injector and discharging into a vator channel intended for the collection of the liquid and preliminaryseparation of the bundle of filaments from the liquid.

50 Y The treatments effected in accordance with the invention take placeunder pressures above atmospheric pressure, and this intensifies theaction of the reagents and considerably reduces the duration of thedifferent treatments and the 55 quantities of water and/or solutionsrequired.

The treatment is highly favored by the fact that the liquid entrainingthe sliver and running at a speed much higher than that of the sliveropens the sliver in such a way that the fibres are uniformly distributedthroughout the cross section of the tube, consequently there is a rapidexchange of liquid which results in an intimate contact with the fibres.

By the process according to the invention ex-. cellent results areobtained'in washing, desulphurizing, bleaching, dyeing and the liketreatments of artificial yarns in a very short time -with the employmentof a very simple device which does not occupy a great deal of space.

At the outlet of each tube the sliver is caused to pass over a gridconsisting 01' glass bars or other materials resistant to the chemicalaction of the liquid used for the treatments so that the greater part ofthe liquid may be separated from the fibres, these fibres being thenconveyed to a squeezing device comprising either chamfered or groovedrollers pressed against one another or' preferably only by a series ofrollers on which the sliver is wound and by which the liquid is expelledby centrifugal force.

Apparatus in accordance with the invention is illustrated schematicallyand by? way of example in the accompanying drawing.

The bundle of filaments, sliver or yarn passesv through the funnel Iinto the body of the injector 2 into which by way of the tube 3 isadmitted the washing water as the other liquids appropriate for thevarious treatments. The bundle of filaments or sliver in continuouscontact with the liquid passes through the tube 4, being delivered in tothe vat or channel 5 in which is arranged a system of squeezing bars 6of glass, porcelain, ebonite and the like, these bars having the objectof allowing the separation of the excess of liquid without the bundle orsliver becoming tangled. The bundle or sliver is then caused to passround the squeezing rollers 1 before being conveyed into a subsequenttube. For a bundle or sliver having a titre of 300,000 denier with aspeed of travel of 100 metres per minute, tubes may be used, forinstance of 30 mm. diameter and a length of 20 to 40 metres for eachtreatment. Each treatment requires one or more tubes, for instance forthe washing of the sliver impregnated with the spinning bath threetubes,are employed the water being recovered, that is the water dischargedfrom the third tube is injected in the second tube, and the waterdischarged from the second tube used for feeding the first tube. For thetreatments of desulp'hur izing, and bleaching only one tube is requiredfor each treatment while for dyeing one or more tubes are used accordingto the coloring substances employed.

The treatments disclosed may be also used forartificial yarns oiregenerated cellulose even when they are not destined for the productionof short or staple fibres. In this case the groups" of filaments comingfrom the spinning machine are gathered on appropriate collectors.

For the production of short fibres the bundle of filaments is cut bymeans of apparatus appropriate for-the purpose.

Having now particularly described and ascertained the nature of my saidinvention and in said yarn. through said tube in a longitudinaldirection and so as to keep the yarn taut.

AM Mr. 11

